'''IOK-1''' is a distant galaxy
in the constellation Coma Berenices
. When discovered in 2006, it was the oldest and most distant galaxy ever found, at redshift
It was discovered in April 2006 by Masanori Iye
at National Astronomical Observatory of Japan
using the Subaru Telescope
and seen as it was 12.88 1,000,000,000 (number)|billion
years ago. Its emission of Lyman alpha radiation
has a redshift of 6.96, corresponding to just 750 million years after the Big Bang
. While some scientists have claimed other objects (such as Galaxy Abell 1835 IR1916|Abell 1835 IR1916
) to be even older, the IOK-1's age and composition have been more reliably established.
"IOK" stands for the observers' names Iye, Ota, and Kashikawa.